python/self.py

#!/usr/bin/env python
#
# Copyright (c) 2008 Google, Inc.
# Contributed by Arun Sharma <arun.sharma@google.com>
# 
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the "Software"),
# to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense,
# and/or sell copies of the Software, and to permit persons to whom the
# Software is furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
# THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
# 
# Self monitoring example. Copied from self.c

from __future__ import print_function
import os
import optparse
import random
import errno
import struct
import perfmon

if __name__ == '__main__':
  parser = optparse.OptionParser()
  parser.add_option("-e", "--events", help="Events to use",
                    action="store", dest="events")
  parser.set_defaults(events="PERF_COUNT_HW_CPU_CYCLES")
  (options, args) = parser.parse_args()

  if options.events:
    events = options.events.split(",")
  else:
    raise Exception("You need to specify events to monitor")

  s = perfmon.PerThreadSession(int(os.getpid()), events)
  s.start()

  # code to be measured
  #
  # note that this is not identical to what examples/self.c does
  # thus counts will be different in the end
  for i in range(1, 1000000):
    random.random()

  # read the counts
  for i in range(0, len(events)):
    count = struct.unpack("L", s.read(i))[0]
    print("""%s\t%lu""" % (events[i], count))